; Exercise 1.2
; Translate the following expression into preﬁx form. 
; 5 + 4 + (2 - (3 - (6 + 4/5))) 
; ----------------------------- 
;       3(6 - 2)(2 - 7) 
; 

(/ (+ 5 4 (- 2 (- 3 (+ 6 (/ 4 5)))))
   (* 3 (- 6 2) (- 2 7)))


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